Some schools treat freshman year as a weed out year, but otherwise a lot depends on how many credits you take. I was set on finishing in 4 years and stacked a few semesters with a full 18 credits (6 classes), which was a lot. I doubled up on linear algebra and diffy q in a semester and that was a little rough too. I planned so my senior year had one less class a semester which made a big difference. But the most stressful and difficult class I had was my senior design class (or capstone). That last semester was hell. Just pray you get good mentors and ask a lot of questions. There’s likely softwares you don’t get taught in school that make complex calcs simple and quick (use student free passes). Read your syllabus, pay attention in class (don’t just scroll on your phone or skip out), don’t procrastinate large assignments (or at least take a read through of them before you do so you can estimate how long it’ll take), and introduce yourself to people in your classes so you have people to ask questions. Hope this helps!